Hoisting device



. H, DARRAH.

HOISTING DEVICE.

Feb. 13, 1923'.

sHEE'r 3 SHEE TS FILED MAR-4,1919.

ZlQum WITNESSES ATTORNEY W. H, DARRAH.

HOISTING DEVICE. FILED MAR. 4, 1919.

3 SHEETS-SHEEI 2 INVENTOR ATTORNEY Feb. 13, 1923.

W. H. DARRAH.

HOISTING DEVICE.

FILED MAR. 4, 1919.

3 SHEETS-SHEET 3,

INVENTOR TNESSES ATTORNEY Patented Feb. 13, 1923.

* UNITED STATES PATENT O FFICE.

WILLIAM H DARRAH, or BETHLEHEM, PENNsYLvAN-Ia. I

HOIS'I'ING DEVICE.

Application file d March 4, 1919. Serial No. 280,588.

' a specification.

j This invention relates to improvements in hoisting devices. whereby handling of heavy materials is facilitated. and the principal 01 ject. of the invention is to increase theefliciency of devicesof this character by providing a noveb arrangement of increased power gearing between the lift and operating elements: by providing a novel form of automatic clutchmechanism to prevent accidental downward movement of t'he load from a hoisted position, but which will permit of free operation of the device to'hoist the. load. by providing novel means to prevent tangling of the lift and operating elements. and by constructing the device simply from a. minimum of parts, which are cheap to manufacture.

'ith, the foregoing and other objects in view. the invention consists in the novel features of construction. combination and arrangement of parts as will be hereinafter more clearly described. illustrated in the accompanying drawings and claimed.

In the drawings,

Fig. l'is a side elevation of the hoisting device constructed in accordance with the invention parts being broken away, 4

Figure- 2 is a cross-sectional view of the device. disclosing the arrangement of gearing, the, section being taken in the vertical plane. a I

Fig. 3 is a fragmentary side elevation of the device. parts being broken away,

Fig. 4 is a detail vertical section of the clutch elements,'s how1ng the same sepa-' I rotation upon a stud shaft 16 wlnch has one The frame a 1 is preferably circular in shape, as is the frame 2, and these frames are I held in spaced relationby means of sleeves I; through which pass bolts 4. the saidbolts being also passed through lugs in the clutch frame and having threaded connections with the gear frame whereby the frames are held in rigid spaced relation.

()fi'set lugs 5 are formed upon the frames l and 2. and; these lugs are adapted to be arranged in. alignmenttto receive studs 6 carried by a block? whereby the same is pivotally mounted between the frames.

This meln'ber7 is provided with a central opening to-receive the reduced end of a book 8. the reduced end being extended through the member 7 and having a nut 9 threaded thereon to securethe hook to the frame. By this arrangement it will be noted that the hook 8 may be engaged with any suitable i support and the frame. will be permitted of pivotal movement"relative thereto.

Alignedopeningsare formed centrally in the framenielnbersland.2 to recei v'e. otfset portions 9'. upon either side of a wheel 10.

anti friction hearings in the nature of roll-' vers 11 being arranged between the offset portions ofthe wheel and the walls'of the openings to mount the wheel for freefrotation between the fraine members. This wheel 10 is prov ded upon its peripheral edge with suitablv fol-riled]depressions to rcce'ivethe links (if a lift "velementlin the na t nreof a .cliai1r12. The wheellO is arranged be tween the frame members'l and 2,. as is 4 shown. and the. offset :portlons 9," thereof extend past. the outer faces of the, frameimemhers I] and :2 any, suitable distance, for a purpose which will. presently appear.

Mounted upon the offset portion 9', eX- r tending past the outer face of the gear frame.

is'a pinion 13 which is securedagainstrota tion relatively to. the wheellt) byineans of a key 14. This pinion l3 meshes with a relativelysmaller pinion 15 mounted for free The p nion'15 is provided with an offset portion 17' to which is keyed; asyat-18', a

plIll0Il 19. This pinion 19" isrelati'veIy larger thanthe pinion 15 and mesheswith a relatively smaller pinion 20 rigidly secured ,to' a shaft 21-which extends through ja cem I the outer face of the frame 2. 25 are also formed upon this wheel which tral opening in the wheel 10 and has one end journaled in the casing 1?. suitable bearings in the nature of babbit, brass or the like being provided between the wheel 10 and the shaft 21 whereby free rotation of the shaft relatively to the wheel is permitted.

A pinion 15 is mounted upon a stud shaft 16' which is carried in a manner similar to the shaft 16 at a point upon the frame diametrically opposite to the shaft 16. Also a pinion 19 is keyed to the pinion '15" similarly to the pinion 1.) and this pinion is adapted to mesh with the pinion 20 upon the shaft 21, the second set of gearings being a duplicate of that first described, and serving to increase the durability and strength of the device.

The offset portion of the wheel 10 projecting through the frame 2 has mounted there on for free rotation a wheel 22 which is pref.- ,erably of slightly smaller diameter than the frame'member 2. This wheel is enlarged adjacent its circumferential edge and is providedwith a series of openings to-receive friction blocks 23. thesame being adapted for engagement with friction faces 2- upon Ratchet teeth are adapted to be engaged by pawls 2(3 pivoted to the frame 2 and held in engagement withthe teeth by means of springs 27 which may be mounted in enlargements 28 carried by the frame. The shaft 21 extends past the outer face of the offset portion of the wheel 10 and is reduced as at 29 so that a shoulder 30 is provided. Keyed for longitudinal sliding movement upon the reduced portion of the shaft is a sleeve 30' which has its periphery. adjacent its outer end. threaded to receive an interiorlythreaded cam member 31. This cam member 31 is provided with a plurality of inclined faces32 upon its inner face which are adapted to be engaged by similar faces 33 upon an operating. wheel 34. This wheel is mounted for free rotation upon the sleeve 30. is of any desired diameter. and provided upon its inner face with friction faces 35 arranged in alignment with the. blocks 23. The periph' eral edge of thisoperating wheel is provided with depressions similar to the depressions in the wheel .1) to receive the links of an operating chain 36. r

The free end of the lift chain 12' is adapted to be secured to a bracket 37 secured in any suitable manner between the frame members 1 and 2. and this chain is adapted to extend dowmvardly from the bracket.

thence upwardly and over the wheel 10 and then downwardly to-be provided with a hook of any deslred type to be engaged with the object or material to be hoisted. while the operating chain 36 is adapted to extend over thewheel 34 whereby pulling upon the same wheel may be freely operated element in the nature ()f zi will rotate the wheel. the said chain 30 being endless it"so desired.

'In order to retain the chain 36 in engagement \\'1th the wheel 34 l secure to any suitable portion of the frame. a plurality of re taming elements 38 which are adapted to overlie the chain to prevent its accidental. removal from the wheel.

In order to prevent the lift portion of the chain 12 from becoming engaged with the slack thereof occurring when the deviceis operated. l secure between the frame members l and 2 below the wheel ltha bracket 3!) which is provided with an upwardly ex' tending arm 40 disposed adjacent the. recesses of the wheel. '.\s the loose portion of the chain engages this arm it is caused,

to be disengaged from the recesses of the- 36 in the direction of the arrow shown in Fig. l of the drawings. The angular faces of the wheel 2-H and the cam member 31 are at this time in close contact so that as slightrotation is imparted to the wheel upon pulling the chain 36 the cam member will be caused torotate upon the sleeve 30 and because of its threaded engagement therewith will be unscrewed so as to move outwardly into binding engagement with the nut 4(lthreadcd and locked upon the outer reduced end of the shaft 21. Thus the wheel together with the cam member will be permitted a slight outward movement as an entirety whereas the sleeve will be forced over against the hubof wheel 22 todisengage the friction block 23 from "the friction face of the operating wheel 34. whereby the to rotate. the shaft 21 which. through the gears 19. 15. and 13 will rotate the wheel 10; to operate thechain 12. l pon releasing the operating chain to free the load for lowering reverse movement of the shaft 2i due to the weight of the object being lifted will cause the sleevei-il) to be rotated which. because of its threaded connection with the am mem ber 31. will revolve the cam meml'ier i-llwithout necessarily causing it to screw onto the sleeve. since the operating wheel reverses easily with it and-the weight of the chain offers but slight resistance. The load mav thus be lowered by merely letting go of the chain. However. to prevent the load from descending entirely or to hold it in sus en: sion. it is only necessary to grasp the c ain and hold the wheel 34 from reversing, in

which case. the continuous rotating of shaft faces :H-ofthe frame member 2.1imiting any further'slidin movement of the 'oieratin P i 5 wheel in that direction and thus causing" the cam member 31 to be separated from the wheel by the action of their respective cam surfaces. this action tending to move the cam member outwardly until it abuts against the nut 40. This will result in the blocks :23 being frictionally engaged by the faces 24 and 35 upon the frame member 2 and wheel 34 respectively so that further rotation of the wheel 10 will be prevented. the pawlsvlti engaging with the ratchet teeth 25 serving to prevent rotation of thewheel 22 carrying the blocks .23 in a reversed direction. as will be understood. It is not necessary or essential that the ratchet wheel 2; rotate with the wheel 34 when the device is in operation. and it is probable that the motion of the ratchet wheel will be intermittent. the sainebeing made rotatable in order I to permit the friction faces to firmly engage before rotation of the wheel 10 is stopped.

It will be noted that the tendency of the angular faces of the wheel 3-1 and cam member 31 is to work away from each other.

thus wear between the friction faces of the lH'HkQJHtIHlMIS'lS taken up automatically.

It is to be understood that the wheel 1!) may be replaced by a drum to receive a cable. but slight alterations of the device being necessary in order to so adapt the same.

Also it will be obvious that by replacing the wheel 34b one having gear teeth thereon a motor or another operated gearing of a any desired type may be applied to the device to supply the necessary power for operation. It will also be understood that the housing formed by the casing 17 may be, provided with abath of-oil to lubricate the gears arranged therein so that the devicein use will be thoroughly lubricated and practically noiseless.

From the foregoing description taken in connection with the accoiiipan \'i1ig drawings. it is thought that, the construction and operation of the improved hoisting device will lie-clearly understood and while I have herein shown and described certain specific embodiments of my invention. I do not wish to be limited thereto except for such limitations as the claims may import.

I- claim:

1. In a device of the character described. a frame. a lift wheel carried by said frame. a shaft having a reduced end journaled in said wheel for free rotation. a plu'ality of gears connecting the wheel with the shaft.

a sleeve keyed for sliding movement upon the reduced end of the shaft. a wheel loose onsaid sleeve. a memberthreaded for rota tion on said sleeve. and angular engaging cam faces between the memberand the said operating wheel.

2. In a device of the character described. a frame. a wheel mounted on sa d frame. a

shaft. gears connecting said wheel with" said shaft whereby the. latter is rotated. a sleeve slidable upon said shaft, a cam member threaded for movement upon said sleeve and an operating wheel for turning said,

cam member on: said sleeve whereby the latter may. at times be moved outwardly from said operatingwheelsmeans on said shaft to limit sliding movement of the sleeve.- means to limitmovement of the cam member and frictional means interposed between the frameand the last mentioned wheel.- said sliding movement of the said sleeve.

3. In a device of the character described. a frame. a wheel lournaled thereto with its frictional means adapted to be held spaceil from said operating wheel .by the forward hub extended. a shaft. gears connecting the wheel with the shaft. a brake wheel mounted upon the extended hub of the said first wheel and on the outside of the frame. frictam blocks carried by said brake wheel.

ratchet teeth formed below the friction blocks. pawls carried by the frame for en-' gageiiient with said teeth. operating means and a sleeve slidably supporting said ope'ratingmeans upon saidshaft. said sleeve being keyed to said shaft and adapted for sliding abutment with said brakewheel for moving it into frictional engagement with the side of the said frame for preventing rotation of said shaft. i v v I 4. In a device of the character described.

a frame. a lift wheel carried thereby. a

shaft. gears connecting'the wheel with the shaft. said shaft being reduced to ])l'()\ltlt.- a shoulder, a sleeve keyed to slide on the reducedportion of the shaft. a cam mem--- ber threaded upon said sleeve. a nutcari'ied by the reduced portion of the shaft. an operating wheel loosely mounted upon said sleeve. cam faces formed on the operating wheel for engagementwvith the cam face-s upon the cam member. a. brake wheel mounted to revolve freely between .thesaid frame and the inner end of the sleeve.

ratchet teeth formed on said brake wheel. and pawls carried bythe frame for engage ment with theteeth;

In testimony whereof I aflirt my signature in presence. of two witnesses. WILLIAM H. DARRAH. w Witnesses: t i AUSTIN F. J. NEWMAN,

' HOWARD KEPNER. 

